Touch screen



FIG. 1 is a front view of a touch screen, showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a top, front and right side perspective view thereof.

The broken line portion of the figure drawings represents structures forming no part of the claimed design. 

CLAIM The ornamental design for a touch screen, as shown and described. 